Classes like that always make everything sound way more serious than it needs to be. If your finish has held up fine so far, a 2 day class probably isn't worth tossing your whole routine over.

Wait, so you changed your whole system because one dive sup made you redo some numbers on a pier job that went fine for 6 years? I get that bailout math matters, but a 1.5x rule on a 40 pony is already pretty generous for most shallow work, and pier inspections in Galveston are what, 30 to 40 ft on a bad day? The 90 ft with deco thing sounds like a whole different kind of dive, so of course the factor changes. Seems like your old shortcut didn't fail, you just ran into a deeper profile and the sup wanted it by the book. Not saying don't check your math, but calling it undersizing on two other dives makes me wonder if those were really that deep or if you're just spooked now.